/*
 * Copyright 2016-2019 yoara
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package yhao.infra.web.common.tcc.reflect;

import org.apache.commons.lang3.StringUtils;
import org.springframework.beans.BeansException;
import org.springframework.beans.factory.config.BeanPostProcessor;
import org.springframework.stereotype.Component;
import yhao.infra.apilist.tcc.TccFeign;

import java.lang.reflect.InvocationHandler;
import java.lang.reflect.Method;
import java.lang.reflect.Proxy;

/**
 * 将标注有{@link TccFeign}注解的方法代理处理
 *
 * @author yoara
 */
@Component
public class TccBeanPostProcessor implements BeanPostProcessor {
    private static final String FEIGN_CLAZZ_NAME = "feign.ReflectiveFeign$FeignInvocationHandler";

    @Override
    public Object postProcessBeforeInitialization(Object bean, String beanName) throws BeansException {
        return bean;
    }

    @Override
    public Object postProcessAfterInitialization(Object bean, String beanName) throws BeansException {
        if (!Proxy.isProxyClass(bean.getClass())) {
            return bean;
        }

        InvocationHandler handler = Proxy.getInvocationHandler(bean);

        if (!StringUtils.equals(FEIGN_CLAZZ_NAME, handler.getClass().getName())) {
            return bean;
        }

        try{
            Method[] methods = Class.forName(beanName).getMethods();
            for(Method method:methods){
                if(method.getAnnotation(TccFeign.class)!=null){
                    TccFeignHandler feignHandler = new TccFeignHandler();
                    feignHandler.setDelegate(handler);

                    Class<?> clazz = bean.getClass();
                    Class<?>[] interfaces = clazz.getInterfaces();
                    ClassLoader loader = clazz.getClassLoader();
                    return Proxy.newProxyInstance(loader, interfaces, feignHandler);
                }
            }
        }catch (Exception e){}
        return bean;
    }
}
